Concrete-work fastener



uni/Ins s. amen, or CHICAGO, ILLINOIS.

CONCRETE-WORK PASTENEE.

Specification of Letters Patent. Patented July 22, 1919..

Application filed May 7, 1919. Serial No. 295,357.

To all whom ttmay concern.-

Beit known that I, JAMEs S. BIRCH, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Concrete-Work Fasteners,of which the following is a specification.

This invention relates in general to concrete and plastic work and moreparticularly to fasteners intended to firmly hold a mold againstaccidental spreading when the concrete or plastic material is pouredthereinto, although :after' the concrete has hardened, the fastener maybe readily removed therefrom.

Another object of this invention is the production of a concrete workfastener which includes a threaded rod which is connected to the twowalls of the mold and is anchored in place, a sleeve of spirally twistedwire being placed upon the rod while the rod is being placed inengagement with the mold as above specified, whereby after the concretehas hardened the rod may be re: moved and the mold displaced and thenthe end of the sleeve may be gripped and pulled, thus causing the spiralsleeve to slightly contract and break from engagement with the concretethus allowing the same to be easily removed and to be used again.

One practical form of construction and assembly of the present inventionwill be rial 6. which is shown as .its end hereinafter described and isillustrated in the drawing, in which Figure 1 is a side elevation of thefastener with a portion 0-1": the sleeve and the concrete and mold beingshown in section.

Fig. 2 is a vertical section through the device.

lln the preferred embodiment or the present invention about to bedescribed, it will be seen that the parallel Walls 5 of an ordinaryconcrete or plastic mold are shown and the usual filling of concrete orother mateplaced within the mold in the usual manne A'supporting rod 7is provided and has portions threaded as shown at 8, this rod beingpassed through the two walls 5 as will be hereinafter more clearly setforth.

This rodis retained in position by nuts 9 carried upon the threaded end,portions 8 thereof, these nuts 9 bearing upon washers 10 also carriedupon the rod 7 and bearing upon the outer surfaces of the wall 5.

Particular attention is invited to the sleeve'of the rod 7 which isformed from a strand of heavy wire, this wire being coiled to form a.plurality of contacting, convolutions to form a protector sleeve 11.This sleeve 11 is of a size sufi'ioiently large to receive the rod 7 asillustrated in both figures of the drawing.-

In application of the device, the walls 5 of the mold are set up as isthe usual prac tice and then the rod 7 is passed through one of thewalls and is then passed through the protector sleeve 11, this sleeve atthis time being placed between the two walls 5. The rod may then 'bepassed through the remaining wall and thus the protector sleeve will besupported upon the rod. The washers and nuts may then be applied to therod 7 as shown in Fig. 1. It will be understood that this protectorsleeve will act as a spacer to hold the walls at a proper distance aparteven when the nuts are tightened upon the end portions of the rod, forwhen the walls move toward each other they will finally jam theconvolutions of the sleeve upon each other to such an extent as willprevent fur ther compression of the protector sleeve, and thus the walls5 will be held properly in spaced relation. It is obvious that theseprotector sleeves .may be out to provide standard widths for'the wallbeing formed between the walls 5, such widths being for instance 8, 10or 12 inches as desired.

After the plastic material "has become, 9'0 hardened the nuts andwashers may be removed from the projecting ends of the rod and the rodmay then be gripped and pulled outwardly. As the concrete and plasticmaterial does not engage the rod, the rod will not stick and for thisreason may be very easily removed. The wall 5 of the mold may then bedisplaced and access therefore is allowed to the plastic material 6 andalso to the ends of the protector sleeve 11 so carried within thisplastic material 6. Either end of the sleeve may be gripped by a pair ofpliers and may then be pulled outwardly, owing to the fact that thesleeve is hollow and is not at this time reinforced by the rod"- 7 it isobvious it may slightly contact and thus break from engagement with thecement or plastic material 6 and may then be very easily pulledoutwardly from its-ongi-f nal position within the plastic material 6.

With devices ordinarily in use where bolts are employed or bars areused, these bolts or I 'will holding the mold against spreading, while Ithe mold apart.

been completed the entire device may be re-- bars very often wedge orstick so tightly within the plastic material that it is often necessaryto cut offtheir projecting ends and thus considerable loss is exerienced in use of devices of such nature. lhe, present protector sleevemay be placed upon all of such' devices andobviously after the bolts,

barsor rods are removed then the mold is displaced and after this actionthe protector sleeve may be easily removed and then be in condition tobe used again.

It will therefore be noted that a very simple protector sleeve has beenrovided which may be used any number of tlmes and which protect the boltor bar or rod used for the sleeve will properly space the walls of fter.the operation has moved as above specified and used again.

- The foregoing description and drawings have reference to what may beconsidered the preferred or improved formof .my invention. It is to beunderstood however.

that I may make such changes in construction and assembly of parts,materials, dimensions, etc., as may properly come within the scope ofthe appended claims.

Having what" I claim as new and desire to secure by Letters Patent isl 1. In combination with a mold conslstmg of a pair of walls, meansspanning the distance between said walls for holding the same fromspreading, and a protector sleeve posiw tionedupon said first mentionedmeans formed from a strand of wire and coiled to provide a plurallty of"contacting convolutions, whereby after said mold and said firstmentioned means are displaced said sleeve may be gripped and pulledoutwardly from en aagement with a'body formed within the mo l fullydescribed my invention,

- In testimony v strand of wirecoiled to form a plurality ofconvolutions, whereby after a body has been formed between said walls,said rod may be removed after which the sleeve may be gripped and pulledto be slightly contracted, thus causing the same to be easily removedfrom such body.

of a pair of walls, means spanning the dis-' tance betwe'ensaid' wallsfor holding the same from spreading, and a contractible protectorpositloned upon said means, whereby after said mold and means aredisplaced, said protector may be slightly contracted to be easily movedfrom engagement with the body formed by said mold.

3. In combination with a mold consisting 4. 'In combination with a moldconsisting of a pair of walls, a rod spanning the distance between saidwalls and passing therethrough, means carried upon the projecting endsofsaidrod to hold the same against displacement, and a contractibleprotector carried upon said rod betweensaid. wall,

whereby after a body has been formed between said walls said rod may beremoved and then said protector may be slightly contracted to easilymove from engagement with the body formed between said wall.

whereof I afiix my signature in presence of two witnesses.

- s s. BIRCH.

. Witneses:

, JA. MM ELDON H. Ricnnnncna.

